NBA Hangtime help

tinsley

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I have a NBA Jam (not dedicated, in a 4-player Konami cab) that I am trying to put a Hangtime board in. When I power it up, I get nothing. Just a black screen. Nothing else. Jam works fine in the machine, but nothing with this board. So, anyone have any idea what it could be? I don't get sound or anything out of it...
 
first, do you know that the Hangtime board works? if it does, is your +5 voltage set right? I don't know all the tolerances, but there's a chance an NBA Jam (T-unit) board can run with lower voltage vs. a Hangtime (Wolf unit) board, thus rendering it unable to boot.

other than that, I don't know what to tell you. either the board's no good or your power supply isn't adjusted right. you might want to check the JAMMA edge on the Hangtime board and make sure the contacts aren't extremely dirty and fudged up. you can clean this with a regular pencil eraser on the small portion of the JAMMA edge (where the power wiring goes) making sure not to get the rubber shavings into the board, frequently wipe them away.
 
not sure, i just got this board. it may be a dud.. i cleared the contacts. tested power, it is at 5.1v, which should be fine.... i am mssing the -5v wires, but aren't those only for audio? i powered it up with all the lights out and notice the screen is not totally black, it has some very faint red diagonal lines running thru it... anyone else ever seen this before?
 
is that when the game's powered on or not? if it does that with no game (make sure your game power supply isn't turned on with the game unplugged, or you risk damaging it) then those are retrace lines. either your Red Bias is up too high or your flyback's Screen pot is too high.

if the game's causing that, you might have corrupted roms or something. or the board's bad. are you getting +5 at the roms by chance? assuming the U-shaped notch is facing the left side of the rom, put your meter probes on the upper left and lower right pins to get a voltage reading, being careful not to slip and cross the pins with the probes. lol it's best if you have a flat surface to do this, but if it's mounted in the cab then you don't have that luxury. :)

next order of attack would be to inspect the traces on the board, make sure there's no breaks. if you're not getting voltage to the roms especially, check where the power section of the JAMMA edge goes to components on the board. I don't know if you're getting any lit LEDs on the board or not so..
 
1 of the 3 LEDs are lit. The monitor works fine with NBA Jam plugged in the cab, so it is good. I haven't checked for voltage across the ROMs yet, will do so later today...
 
mecha: reseated all the chips. i am actually getting the game to boot now. i added the 2 -5v connections to the edge connector. apparently these boards will not boot without that. i now get 4 bad roms. these are not labeled in any way, but the 4 bad are all in a roe (u133, u129, y125, u121). so, could it be just bad chips (all 4, in a row - i kinda doubt) or something more (like out of place somehow). how can i determine which chip goes where without them be labeled? is there a correct way to cycle these chips throughout each slot? i am having no luck...
 
if it's a row of roms, another user mentioned something about pins on the rom sockets touching each other or nearby traces on the back side. check that area of the board to verify that.

if it's not that, I wouldn't go entirely crazy trying to rearrange the chairs on the titanic if you will, they're probably the correct roms, I'm leaning towards it just being a board issue.
 
i'm thinking bad trace, dust bunny/spider web in or under the socket, bad contact between prom pins and socket on the socket side, or bad solder joint.

we've been chatting about this on the other forum, definitely check those socket legs on the solder side. As that was the issue with booting.
 
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